Audible air speed annunciator



y 1932- .1. E. ESHBAUGH 6-0 AUDIBLE AIR SPEED ANNUNCIATOR Filed June 24, 1951 -IN VENT OR J'Esss E Esnanuqu.

Patented July 1932 of 1.1;-

: JESSE ESHBAUGH, orrrm'r; MICHIGAN nunriamr Ara. srnnn annuncmron 7 Application filed June 24,

This invention relates to aircraft and has for its object to provide a device for notifying, by audible means, the occupants of an aircraft of'the upper and lower limits of a (predetermined speed range;

' The invention consists ofthe mechanism arranged and employed for utilizing the dynamic air pressure to drive and' 'c'ontrol a siren, and in certain details oficonstruction and comb atlon of parts, {all of which'will be'firstfullydescribed and afterwards specifically pointed out in the appended claims.

Referring to the accompanying draw ng:

' Fig. 1 is a side View partly in longitudinal Vertical cross-section illustrating the dev1ce in one operating position g Fig. 2 is a view'simil'ar'to Fig. 1 illustrating the rotor in a different operating position Fig. 3 is a front plan View of the rotor and rotorhousing; and a V Fig. 4 is a sectional view 'taken on the line 44e of Fig. 1. I g

Referring to the drawing by reference numerals: 5 1 indicates the siren which includes the casing 2 terminating in the shell 3. i

a indicates the rotor mounted on a shaft 5,

which is rotatable and slidable within j the f journal 6. The inner end of said shaft terminates in a flange 7. T

Disposed within the tubular portion 8 of the casing 2 is a spiral spring 9held between i and 11, thecup 11b6111g positionedagainst shoulder 12, while the cup two spring cups 10 '10 receives a tension adjusting 'screw' 13 threaded through the end 14 of the casing.

, Disposed within the spiral spring 9 is a smaller spiral spring 15 confined in two cups 4 16 and17.

a shoulder 18, and between the said cup17 and the flange 7 of the shaft 5 isaball 19.

Acting against the cup 16 is a tension adjusting screw 20 threaded through the firstmentioned adjusting screw 13, each of said screws being of equal pitch andhaving notched'heads 21 held by spring actuated pawls 22. Adjag cent to the sc'iewhe'ads 21 is a calibrated scale- 23 to which the screws are adj ustedaccording to predetermined'calculations." Bymeans of 'Refer ng to The cup 17 1S posltlon'ed'aga-Jmst "said airpres'sure on the rotor-: 1 overcomes the 1 931. seri l m5, 5463319; v V this arrang geinent, the tension of the springs 9 and 15 canbe'independently adjusted.

fReferringt'othe shell 3, the same is provided near its outerend 24 with alseries of narrow slots 25 and near its base 26 withfaseries of similar slots 27, while between said two series of slots 25 and 27 is ta blank portion 28, and in the base 26Iis a'fseriesof I. air passages 29. l

two, sets ofiblades 30 and 31, the "former' of which are arranged'radially and .closely jad 1 j acent the shell 3, while'the latter are: disposed angularly to the aXiSrbtation ofthe rotor.

Having thus describedthe construction and arrangement of the parts of the invention, its operation is'as follows:

The device is 'mounted on an aircraft so thatftheaxis of the rotor will, beparalleL- to the line of flight of the aircraft, The air" pressure created by the speed of' the aircraft acts; upon the faces of'the blades 31 'revolving under the slots 25 in thecasing 3 and alternatelyj opening and 'closingfthe same to the passage of air through said slots ea'cieates '75 a series of rapid" alternate compressions and rarefactions which produce. a" siren' note.

The tensionjof thei'nn'erspring lo is set so that therotor will continue to rotate under the first seriesof slots25 inthejshell 3 as long so as t the air pressure on V the rotor. 4 remains within a. certain predeterminedlimit,within whichlimit the rotor 4 will not moyeout of cooperative relation with the first series of, slots 25, and the siren note willthus be con- "tinuously', produced.

" When,lhowever, the speed of the. aircraft is increased and the air pressure isi'acc'ordingly increasedbeyond apredetermined limit,

tension of. the inner springlfi, and the said .rotoris causedto move out of cooperative rej lation withxtheffirstseries, of slots- 25 and further. inward movement'is impartedlto the rotor which causes the spring (mp1? to mov 1 I th rotor 4 compfisesmoo slots in the said shell.

tween the radial blades and the said slots 27 to again create a continuous siren note.

By means of this construction the tension on the rotor 4 can be regulated so that within 7 a certain predetermined low range of speed of the air craft, a continuousgsiren note will be sounded, while within a certain predetermined intermediate speed range, the s'iren'will be silent, while within a certainpredetermined high speed range; a continuous siren note will again be sounded. The result ls thatthe device furnishes angiaudible means by whichf'all occupants of an aircraft are informed as to the speed of the aircraft within Q certain predetermined ranges, which predej termination can be changed or altered as may i be desired. 7 r Having thus fully described theinventlon,

I do not wish to be understood as limitingmyself to the exact construction herein set forth, but consider myself clearly entitled to all I such changes or modifications as'fall' within the limit and scope of :the appended claims.

What I claimasnew and desire to secure I 1 by Letters Patent oftheUnited States-is lfA device of the character described, in-

I cluding a casing having when, the shell beingprovided with two series of slots andhaving a blank portion intermediate the said two series of slots,'a rotor and a shaft slidably mountedin said casing, said rotor includin Q a series of blades disposed adjacent to sai casing andia series of propelling blades, a

' spring in said casing and means for adjusting the spring to resiliently hold the said rotor n cooperative, relation with the outermost 'series of 1 slots in the said shell, a further a spring within the casing and means for adthe sameto resiliently hold the said rotor in position intermediate thesaid two 7 f series of slots in the shell, the last mentioned j spring being capable of compression to permit movement of said rotor into cooperative relation with the innermost of said series of 2. A device of the character described including a'ficasing' having a shell, the shell be- ]ingprovided with two series of slots and hav- .ing aublank portion intermediate the said two series of slots alrotor and a shaft slidably mounted in said casing, said rotor including a series of blades disposed adjacent to said casing and a series of propellingblades, adj u'stable meansvfor resilientlygholding the said rotor in cooperative relation: with the outer-- most series'of slots in the saidsh'ell, further adjustable means for resiliently holding the said rotor in position intermediatethes said two series of slots in the shell, the said twoesi e l h di mea ed iit i vslots, and means for holding the said rotor in means for resiliently holding the said rotor "inposition intermediate the said two series of slots in the shell, the said two resiliently hold- :mg'means being adapted to permit movement of saidrotor into cooperative relation with the innermost of said series of slots.

4. A device of the character described, including a casing having a shell,the shell being provided with two series of slots and having a a blank portion intermediate the said two series 7 of slots, a rotor includingmeans to receive airpressure for self propulsion, adjustable means for, resiliently holding the said rotor i-n cooperativerelation with the outermost seriesjof slots, for resiliently holding the rotor in intermediate positionlbetween the said two series'of slots, and permitting movement of; said rotor into'cooperative relation with the innermost series of slots inthe casing.

5, A deviceof the character described, including a casing having a shell, the shell being provided with two spaced apart'series of slots, a rotor including means to receive air pressure for self propulsion,---means for holding the rotor in cooperativefrelation'with the outermost series of slots, for holdingthe rotor in position. intermediate the said twoseries of slots, and for permitting movement of the said rotor into cooperative relation with the innermost series ofslots. V

6. A device of the character described, a

casing'provide'd with two spaced apartseries of slots, a rotor including means for receivng a1r pressure for self propulsion, said rotor being adapted to rotate in vcooperative relation with the outermost of the series of a position intermediate said spaced apart series of slots and for holding said rotor in cooperative relationwith the innermostseries V ofslots. i Y i 7. A device of the character described in-Ti cluding a rotor and a shell, the rotor including means to receive air pressure for selfpropulsion, the shell having two spaced apart series of slotsfor'cooperation with said rotor successively'and independently, and means for hold- 3 'lngsaid rotor in. a position-intermediate said spaced apart series of slots, V a j 7 8. A device of'the character described including a rotor and a-shell, the-shell being K provided with two spaced apart series of slots; 5

means for holding said rotor in cooperative relation with either one of the two spaced apart series of slots, and for holding the rotor out of cooperative relation with either one of the two spaced apart series of slots.

9. A device of the character described, including a shell, a rotor slidable and rotatable in the shell, the shell being provided with means for cooperating with the rotor to produce a note, means for holding the rotor in cooperative relation with the said means in the shell, and for holding the said rotor out of cooperative relation with said means in the shell to silence the device.

10. A device of the character described, including a shell and a rotor, the said shell being provided with means for cooperating with the rotor to produce a note, the said rotor being slidable within the shell, and means for holding the said rotor in and out of cooperative relation with the said means in the shell.

11. A device of the character described, in cluding an air driven rotatable and slidable member, and means cooperating with said member to produce a note, and means for holding said member out of cooperative relation with the first mentioned means to silence the device.

12. A device of the character described, including an air driven rotatable and air shiftable member, means cooperating with said member to produce a note, and means for controlling the shift of said member out of cooperative relation with the first mentioned means.

13. An audible air speed annunciator for aircraft comprising sound producing means actuable by dynamic air pressure and means for causing the sound-producing means to be actuated only at the upper and lower limits of a predetermined speed range.

14. An audible air speed annunciator for aircraft comprising sound-producing means actuable by dynamic air pressure created by relative motion of air and annunciator, and means responsive to the dynamic air pressure for causing the sound-producing means to be actuated only at the upper and lower limits of a predetermined dynamic air speed range.

15. An audible air speed annunciator for aircraft comprising a pneumatically driven siren, the rotor of which has blades designed for both propelling the rotor and producing the characteristic soundof a siren.

In testimony whereof I afiix my signature.

JESSE E. ESHBAUGH. 

